Non-stop events!
Have mercy.
Right? However, I think quest events are a nice way to let players get some premium items here and there without feeling like they 'have to' buy diamonds in order to win (like the currency events). I do think the quests should be more varied, if not simplified, though. For instance:
1. Quests that require you to complete a specific production could instead ask for any production. I know this is possible as it was seen in the final quest for the Valentine's event! This would allow players to continue their normal/preferred production cycles and still get quests done, as opposed to the current model where players may be forced to select options that they don't like. It seems to me that quests most often ask for 5-minute or 24-hour productions, when a significant portion of players uses 4- and 8-hour cycles.
2. Quests to research a technology, scout a province, and acquire a province should be re-evaluated as these, again, may cause players to feel forced to change their playstyle (I personally groan when I see these quests, because they feel more like work than fun). Some players choose to remain in a specific age for a prolonged period of time, and these quests can eventually cause them to either advance beyond the capabilities of their production/military, or to advance to a new age when they perhaps may not be ready for it. Yes, advancement is definitely a core aspect of the game but we all achieve that in different ways and I believe that events should be open to that.
All that being said, events are still an extra opportunity to get free stuff which is always nice!